package com.example.community.Controller.interceptor;

import com.example.community.entity.LoginTicket;
import com.example.community.entity.User;
import com.example.community.service.UserService;
import com.example.community.util.CookieUtil;
import com.example.community.util.HostHodler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.context.SecurityContextImpl;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;

/**
 * @Author: Ctc
 * @Date: 2022/3/31 17:33
 */
@Component
public class LoginTicketInterceptor implements HandlerInterceptor {
    @Autowired
    private UserService userService;
    @Autowired
    private HostHodler hostHodler;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //从cookie中获取获取凭证
        String ticket = CookieUtil.getValue(request, "ticket");
        if (ticket != null) {
            //查询凭证
            LoginTicket loginTicket = userService.findLoginTicket(ticket);
            //检查凭证是否有效
            if (loginTicket != null && loginTicket.getStatus() == 0 && loginTicket.getExpired().after(new Date())) {
                //根据凭证查询用户
                User user = userService.findUserById(loginTicket.getUserId());
                //在本次请求当中持有用户
                hostHodler.setUser(user);
                //构建用户认证结果，存入SecurityContext，以便Security进行授权
                Authentication authentication = new UsernamePasswordAuthenticationToken(
                        // principal: 主要信息; credentials: 证书; authorities: 权限;
                        user, user.getPassword(), userService.getAuthorities(user.getId()));
                SecurityContextHolder.setContext(new SecurityContextImpl(authentication));
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        User user = hostHodler.getUser();
        if (user != null && modelAndView != null) {
            modelAndView.addObject("loginUser", user);
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        hostHodler.clear();
    }
}
